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 Post subject: Additional astronomical symbol for Earth?
PostPosted: Wed Mar 20, 2013 10:42 am 
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Joined: Mon Mar 18, 2013 3:17 pm
Posts: 1
Currently, there are two Unicode codepoints for symbols representing the Earth, used mainly in historical publications and contexts: U+2641 (http://unicode.org/cldr/utility/character.jsp?a=2641) and U+1F728 (http://unicode.org/cldr/utility/character.jsp?a=1F728; http://www.fileformat.info/info/unicode/char/1f728/index.htm)

An alternate character to the second one, used to my knowledge in the 18th and 19th centuries, was a circle with an equator line only. See for example this page from an 1872 high-school astronomy text (reference in the Wikipedia article on astronomical symbols): http://books.google.com/books?id=XksAAAAAYAAJ&pg=PA32#v=onepage&q&f=false, where "a sphere and its equator" is given as one of the two symbols. Benjamin Franklin also used this symbol in Poor Richard's Almanac, for example: http://public.gettysburg.edu/~tshannon/his341/pra53293.htm (a little hard to see but starting 9 lines from the top of the right-hand page).

There are numerous glyphs in Unicode that look similar, notably capital '0' with a median bar, Greek capital theta, etc., but nothing I see that is a pure circle with a media bar (in U+29B5 it extends to the sides).

Would it be worth working up a proposal for this symbol?

David Sewell


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 Post subject: Re: Additional astronomical symbol for Earth?
PostPosted: Fri Nov 22, 2013 2:45 am 
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Joined: Tue Dec 01, 2009 2:49 pm
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Looks like circled minus to me. Check http://www.unicode.org/charts/PDF/U2980.pdf and go to page 2, and you find under 29B5 a cross-reference to 2296 CIRCLED MINUS


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